Climate activists are also gearing up for a mobilization on Saturday in Paris—in defiance of a protest ban—at the end of the climate talks.

"Negotiators are avoiding making the real commitments that are required to meet their stated goals of keeping warming below 1.5 degrees Celsius," organizers write. "On December 12, we will honor the victims of climate change with beautiful things to see and build, and make plans with the global movement that has gathered in Paris for the coming years. We will lay down red lines of climate safety that must not be crossed, and collectively pledge to act so that they are not."

"This will be our demonstration of hope, power and strength that we will hold as we bring the fight back to the fossil fuel industry in 2016," the statement continues.

Author and activist Naomi Klein spoke Monday in Paris of the need for the Dec. 12 action, and said that people must recognize the urgency of climate crisis and must also say "yes to the world we want."